Do you mind if I ask which country this was in? If it was a country like India, where foreign law firms are not allowed to operate independently, then no matter how strong your argument is it will fail at this stage.
If there weren't any jurisdictional/permission issues, then it's probably worth caveating your argument by saying that you know that the firm closed their office there in 2019 and that the firm's financials, growth, quality of clientele, ability to make a local impact, range of competitors etc. would be important factors in your decision to re-open.